Controlling device for electric motors.



PATENTED AUG. 11, 1908.

R. E; BARKER. CONTROLLING DEVICE FOR ELECTRIC MOTORS A IPPLICATION FILED DBC.26, 1907.

Inventor, Ralph E. Barker-3 RALPH .E. BARKER,

OF LYNN, MASSACHUSETTS, .ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK. 1 l

CONTRQLLING DEVICE FOR ELECTRIC MOTORS.

Application filed December 26, 1997. Serial No. 408,177.

Total w indy concern; Be it known that I, RALPH E. B a

1 citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts,

have invented certain new and useful Improvements in Controlling Devices for Electric Motors, of which the following is a specification.

.This invention relates to devices for con trolling electric motor circuits and has for its object the provision of a device of this char acter in which certain automatic features of o eration are combined with e'xtremesimp icity of construction in such a manner as to produce a thoroughlyreliable and efficient arrangement.

My invention relates more specifically to devices. for controlling alternating current motors, and particularlythose of the single phase induction type. It is well known that this type of motor will not start from rest unless provided withspecial starting means, such as auxiliary starting windings or phase splittin devices or both. ltis generally desirab e when such starting devices are employed that they be cut out of circuit when the motor reaches running speed, since theyare ordinarily intended to be in circuit for a short time only and would otherwise become overheated. Furthermore, the run ning efliciency of the. motor would be im paired by keeping the starting devices-in circuit. a a

one of the objects of my invention is to provide a simple starting device for this type of motor in which the starting winding is first connected in the motor circuit and then automatically cut out after a predetermined interval. i

In carrying out my invention, provide in connection with a manuallyoperated switch, which closes the circuit of the main motor winding, an auxiliary circuit controlling mechanism in connection with said switch which closes the circuit of the starting winding when the switch is closed, and at the same time, so arranges the parts that the auxiliary circuit controller will operate automatically to cut out the starting winding.

In the-accompanying drawing, in which I have shown my invention embodied in concrete form, Figure 1 is a side elevation of a starting device embodying my inven- Speci'fication of Letters Patent.

the motor is started.

Patented Aug. 11, 1908..

the circuit connections and; Fig. 3 .i a sectional elevation of the.same.=. Referring to the drawings, 10 is an; insulating base of slate, soapstoneor thelike, havupon a-stud 1.1.. an operating handle. 12, insulatedffromthe conducting pivot 11, and -a-sii itch-blade-,13

moved by said handle, but electricallyigzoning mounted thereon a switch arin pivoted This sw tch .arm consists? of nected with the stud. Secured to theswitch 1 and movahle' therewith is an; elongated bracket 14 arranged to receive a metallic ball 15, which moves longitudinally of the bracket. This bracket consists of elongated metallic strips 16 and 17, the former being "electric ally connected with the switclvblade 13, while the latter is insulated therefrom. These strips are mountedinthe bracket parallel with each other and their adjacent faces are grooved at 18 so as to receivettheball between them. The ball is adapted totravel back and forth by gravity-along the conducting strips and rest at opposite ends' tl-ie're of against the insulating portion 19', which holds the ball in'place, and assures ashort i interval of time for the starting of the motor. The switch-blade 13 is adapted toenterthe conducting clip 20 which is made adj ust'able', as shown.

The arrangement of cireuitsand the. mode of operation are as follows: Norniallyg the switch mechanism stands in tl'iefpos iron shown in full lines in Flgt 2-.- To istartthe motor, the switch is moved to th'epos'ition shown in dotted lines. hen thd'switohblade enters the clip 20, the circuit through the main motor winding M is cmnplet'ed; At 'thesame time, the ball 15 starts towards the opposite end of the bracket as the latter is moved towards horizontal position. Bythe time the blade reaches the clip, theballha-s bridged the contacting surfaces '16 iii'id'lZ that a circuit is completed {tl-ii'o'ugh' t h'e-st' ing winding S of the motoi from "the p'ositi'i c conducting strip 1.7, ball 15;'strip 16,switch blade 13 and back tothei'iegati've main. The starting winding and the mainwinding are thus connected in parallel circuit, so that As the switch is closed, the bracket is moved away from the horizontal position, and the ball moves to the opposite end of the bracket. During the movetion; Fig. 2 is a plan view thereof showing l ment of the ball, the starting Winding is in .main to the starting winding, coiiductor 2ly circuit, but when the ball reaches the opposite end of the bracket, the starting winding is'cut out, leaving the main winding alone in circuit.

,cyc'lic connection, but the particular starting connectiogs sho'wn and described form no part of my invention.

\(Vhile my starting device is intended ordinarily for use in connection with very small stood that I do not limit my invention to motors, as for instance, those used in connection with phonographs, it should be underthis particular application, since the principle herein involved may be employed in con-' rolling devices for various types and sizes of motors. I-do not, therefore, regard my,invention as being limited to the above structural arrangement, circuit connections or application, except in so far as it is limited bythe-scope of the claims annexed hereto.

What I claim as new and desire to secure by Letters Patent of the United States, is, 1. The combination with an electric motor having different connections of the windings for starting and running, of a switch for closing the circuit through said windings, and means in connection with said switch 3() and operating independently thereof for automatically changing said windings.

2. The combination with an electric motor having different connections of the windings for starting and running, of a' switch for closing the circuit'through said windings, and an element movable independently of said switch arm and set in motion thereby for changing said windings.

3. The combination with an electric motor having different connections of the windings for startin and running, of a manually operated switc for closing the circuit through said windingsand an element set in motion by the closing of said switch and movable independently thereof for changing said windings after a predetermined interval.-

4. The combination with an electric motor I have shown my device as arranged for starting singlehase motors with the type of starting connec 1011 known as the mono-' said windings.

automatically snacks starting and running, of a manually operated switch for closing the circuit through said windings, a contacting surface for controlling the circuit of said windings movable with said switch, and an element movable upon tion by the operation of said switch, and an element movable by gravity over said. surface for changing said windings.

7. The combination with an electric motor having different connections of windings for starting and running, of a manually-operated switch for closing the circuit through said windings, an elongated and grooved contacting surface movable towards and from a horizontal position by the operation of said switch, and. a ball movable by gravity over said surface for changing the connections of 8. A starting device for electric motors comprising a switch for closing the motor circuit, a contacting surface movable towards and from a horizontal position by the operation of said switch, and an element movable by gravity over said surface to affect the circuit 9. A starting device for electric motors, comprising a manually-operated switch for closing the motor circuit, an elongated contacting surface movable therewith having a horizontal position between the full open and full closed positions of said switch, and an element movable by gravity over said surface to affect the circuit.

10. A starting device for electric motors comprising a manually-operated switch for closing the motor circuit, a grooved contacting surface movable therewith having a horizontal position between full openand full closed positions of said switch,, anda ball movable by gravity in said. groove to affect the circuit.

In witness whereof, I have hereunto set my hand this twenty-third day of December, 1907.

RALPH EJBARKER. 

